Janisk - Hey thanks for the advice! But how do you determine which gear ratio works best for the crf? Is there a math formula that you can share? Do you mean the 1.8mm yellow spring? I dont think they have a black one.

Hi, no worries, everything sounds normal. As long as you have the conical carburator insert fitted on the carburator (old 2006 has cup shaped carburator insert), then it means you have the right engine.
Where did you buy the engine from?^^

I m running ED system with 16/21 fitted, and 52/47. i think i might try to change to the KF black spring and red cluth shoe, do u think its neccessary to oso change to the red centrifugal shoes?

I have found running the 16/20 with the 52/47 to be the best combo for our track with the CRF in the G4S. I run the orion clutch update parts for the UFO clutch. I have also run the standard clutch parts with the black spring and standard shoes with 1 weight removed from the flyweights. Keep the clutch gap low (around .4) and then just tune the spring preload.

As arr see car said, we had a good result with the Orion engines at our recent state titles. I must confess I even ran the whole weekend with a piston and liner set that had eaten a glow plug coil to see what would happen - turns out it still worked fine!! Quite a remarkable engine really. I also used the liner shims and found some good power gains.

These are the screws that I was talking about. They are not fully tightened to the combustion chamber and the crankcase and it was like this when I received it. This is my first engine from Orion, so I am not sure if I should screw them down or not.

These are the screws that I was talking about. They are not fully tightened to the combustion chamber and the crankcase and it was like this when I received it. This is my first engine from Orion, so I am not sure if I should screw them down or not.

Thanks!

thats the way it should be, dun worry. haha. dun overtighten it else, hehe, i heard few ppl overtightened their heatsink screw till it snaps, this might damage the crankcase.

These are the screws that I was talking about. They are not fully tightened to the combustion chamber and the crankcase and it was like this when I received it. This is my first engine from Orion, so I am not sure if I should screw them down or not.

Thanks!

comb.chamber screws are to be tightened to 0.9 Nm in cross pattern and head screws to 1.0 Nm again in cross pattern.. you have to use torque screwdriver..

in fact I don't have one here in Istanbul, one of our friends has got one and it's way too expensive.. something like 250€ ... It's like a screwdriver that you may adjust it via turning it's head to the desired torque value.. Torque wrenches which have a range of 40-200 Nm are much more cheaper than this one

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